Go down and check coupons out. Remember to check price history if it is available. What is best price?
Micro USB input: 5V 1A, Charging display: intelligent digital display, Screen size: 27mmx 17mm, Batteries Type: liquid lithium-ion batteries (18650) 3.7 lithium-ion battery only, USB Output: 5V 2.1A / 5V 1A(Dual USB interface), Product Size: 57mmx 28mm
Aliexpress
There’re some similar (or not) items on Aliexpress
| Image | Product (link) | Price | Coupons |
|---|---|---|---|
 |
Dual USB 5V 1A 2.1A Mobile Power Bank 18650 Lithium Battery Charger Board Module Digital PCB | $3.04 | – |
Click here to search by yourself. Here are coupons that you can use.
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
1. ($6.27): Cuponation9
2. ($6.48): BG00c906
apply code in your basket (cart) after clicking “Proceed to checkout”. Click to copy code and open shop.
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): BGd0b05d, BG2589f4, 00c906, ADMITAD2212, 2022ACTIESNL, Terence, Tabby20, 8Couponsde, MVC8SPRING, BGJUNEGSG9
(these coupons are old, so probably won’t work)
Price history and price alert
Do you need price history chart (for all/most countries) for Dual USB 5V 1A 2.1A Power Bank 18650 PCB Module Board? There we go.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood and Aliexpress (only if product name will be the same as on Banggood and I will post it on social media though, so it’s more like Banggood price alert)).